<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        .main {
            width: 500px;
            height: 500px;
            display: grid;
            background-color: #1abe9c;
            grid-template-columns: 100px 100px 100px;
            grid-template-rows: 100px 100px 100px;
            place-content: end center;
        }

        .main div {
            background-color: skyblue;
            border: 1px black solid;
            /* width: 50px;
            height: 50px; */
        }

        /* .main div:nth-of-type(1) {
            grid-area: a1;
        }

        .main div:nth-of-type(2) {
            grid-area: a2;
        }

        .main div:nth-of-type(3) {
            grid-area: a3;
        } */

        .left {
            display: grid;
            grid-template-rows: repeat(3, minmax(30px, 50px));
            box-shadow: 0 0 5px 2px #4f545f;
        }

        .item {
            font-size: 2em;
            text-align: center;
            border: 1px solid #1abe9c;
        }

        .item-1 {
            background-color: #1abe9c;
        }

        .item-2 {
            background-color: #f68f26;
        }

        .item-3 {
            background-color: #4ba946;
        }

        .item-4 {
            background-color: #0376c2;
        }

        .item-5 {
            background-color: #c077af;
        }

        .item-6 {
            background-color: #f8d29d;
        }

        .item-7 {
            background-color: #b5a87f;
        }

        .item-8 {
            background-color: #d0e4a9;
        }

        .item-9 {
            background-color: #4dc7ec;
        }
    </style>
</head>

<body>
    <div class="main">
        <div>1</div>
        <div>2</div>
        <div>3</div>
        <div>4</div>
        <div>5</div>
        <div>6</div>
        <div>7</div>
        <div>8</div>
        <div>9</div>
    </div>
</body>

</html>